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01-20-2015, 06:31 AM   #1
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Pentax FA77 mm lens Will it work on 645D

Will this lens work on the 645D as AF ? any pros and cons using it with 645D ? I shoot mainly portraits. I have the FA 150 now

01-20-2015, 06:54 AM   #2
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The FA77 Limited is a K mount lens. It is physically smaller than a 645 lens. Its image circle is designed to cover a 35mm full frame and not the larger 645 sensor. There is not an adapter available providing the ability to mount a K mount lens on a 645 camera body. There is the opposite - an adapter allowing a 645 lens to be mounted on a K mount body.

01-20-2015, 06:59 AM   #3
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QuoteOriginally posted by rollsman4 Quote
Will this lens work on the 645D as AF ? any pros and cons using it with 645D ? I shoot mainly portraits. I have the FA 150 now
No, you can only use medium format lenses with the 645D.

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01-20-2015, 09:56 AM   #4
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QuoteOriginally posted by Adam Quote
No, you can only use medium format lenses with the 645D.
People use DA lenses on film cameras. Why wouldn't they try FA lenses on a medium format cameras? Just a little bit of machining... AF would just take a little more than just mechanical connection.

01-20-2015, 10:12 AM - 1 Like   #5
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I hope this doesn't sound rude...

You need to do a lot more research. If you are unsure of what lenses you need, you definitely don't need to spend the $$$ on a 645D. The reason I say this is that you most likely aren't just super wealthy, or you would just go straight to the 645Z. You are trying to save money and that is obviously good for 99% of us. But, if you haven't researched a camera that cost $4k used you are setting yourself up for dissappointment. You would most likely be better off with a K3 or whatever they are about to come out with.
01-20-2015, 10:13 AM   #6
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QuoteOriginally posted by ppohja Quote
People use DA lenses on film cameras. Why wouldn't they try FA lenses on a medium format cameras?
With some DA lenses the image circle is large enough to cover a full 35mm frame. There may be some cutoff or vignetting or loss of image quality in the corners. The image circle from 35mm (full frame) format lenses is not large enough to begin with to cover the medium-format sensor so there will be cutoff in the corners. The flange distance on K-mount lenses is much shorter than that of the 645D/Z too. Around 25.41mm difference.

Last edited by Not a Number; 01-20-2015 at 10:22 AM.
01-20-2015, 10:57 AM   #7
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QuoteOriginally posted by ppohja Quote
People use DA lenses on film cameras. Why wouldn't they try FA lenses on a medium format cameras? Just a little bit of machining... AF would just take a little more than just mechanical connection.
Film and digital K-mount cameras share the mount (hence the K-mount name). 645 cameras have a completely different mount, different connections, different registration distance - everything is different. It would be like dropping a Toyota Camry engine in the back of a Ferrari and just expecting it to work without any changes to the Ferrari.
01-20-2015, 01:12 PM   #8
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Well the 150mm/f2.8 is a great lens for portraits together with the 645D.

01-21-2015, 08:08 AM   #9
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Please give this thread a decent burial. 35mm lenses will not work on a 645 of any sort because (1) they could not be brought close enough to the sensor to focus anywhere other than at extreme macro ranges. There is no way to mount such a lens without fouling the mirror mechanism. This is why you can't use Leica S or Contax glass on the 645 either; and (2) they cast too small an image circle, so you'd end up with a little round image in the middle of the sensor.

The End.

- N.

Last edited by ndevlin; 01-22-2015 at 06:30 AM.
01-22-2015, 05:15 AM   #10
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QuoteOriginally posted by ndevlin Quote
Please give this thread a decent burial. 35mm lenses will not work on a 645 of any sort because (1) they could not be brought close enough to the sensor to focus anywhere other than at extreme macro ranges. There is no way to mount such a lens with fouling the mirror mechanism. This is why you can't use Leica S or Contax glass on the 645 either' and (2) they cast too small an image circle, so you'd end up with a little round image in the middle of the sensor.

The End.

- N.
I had no idea but YES lets BURY This Post. Thank you all
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